Is There a Link Between Lawncare and Mental Health Problems?

Near my home a few weeks ago, I found this sign (pictured on the left) while running outside with my dog. The next picture on the right is a picture I took of dandelions that are found in a lawn just treated with pesticides and herbicides, and the last picture is a dandelion plant* with no pesticide application. Do you see the difference between the two dandelions on these two lawns?

Which lawn would you want your favorite child or pet rolling around in?

Lawns and Pesticides

Lawns were first developed in the 17th Century in England where wealthy landowners could show their financial prowess, for only people with extra money could hire the help needed to hand cut and water these tracks of lawn. As a result, lawns became a sign of status that continue into suburbia today.

Reading the sign, it suggests not removing it for 24 hours in order to insure safety that people and pets do not pick up the poison. This doesn’t really make any sense because persistent pesticides and herbicides can take up to 100 days to break down. In that time, anyone nearby is exposed to toxic chemicals. Some studies suggest it takes years to break down some herbicides.

At least the pesticide applicator placed a sign for a day – most of the times, these toxic substances are put down, but no one knows.

The word pesticide is a collective term for a wide variety of chemicals intended to kill insects, plants, molds, and rodents that are unwanted. Unfortunately, to keep things pretty and perfect these weed killers and pesticides are liberally used, and are used everywhere virtually. As a result, we eat and drink them, inhale them, and take them in through our skin.

Children and Pets at Risk

It is possible that those of us who are low to the ground are most at risk: young children and our pets. Kids and pets love to roll around on the lawn and probably spend the most time there out of all of us. Multiple studies have shown how pesticide exposure in pregnancy and childhood exposure is a known factor in cancer in children, including pediatric leukemia [1] and brain tumors.[2] Harvard research has also shown an association with insecticides and childhood cancer.[3] Chromosomes (the gene clusters in our cells) can become rearranged by the toxins and cause these types of cancer to occur. While there is less study on animals, it has been shown that the animal’s nasal passages and mouth are typical routes of entry for dogs and cats who like to sniff their way through the world. Available studies from Europe showed pesticides are responsible for 37.3% of all suspected domestic animal poisoning enquiries with our dogs representing almost 75% of these.[4]

Adults at Risk Too

In March 2019, for the first time in a landmark ruling, Monsanto was ordered to pay a California man $80 for his lymphoma was linked to the use of Roundup – the most common pesticide available, which is a type of glyphosate.[5] This man, like many people, used Roundup to control weeds on his property. Monsanto, owned by the Bayer company, continues to argue that Roundup is safe. Their argument is that much of the research does not clearly show direct cause. This is true – but it is important to remember that insidious chemicals like this cause cancers via multiple mechanisms, like changes in hormones and the microbiome – and cancers also have genetic underpinnings that take a few decades to become apparent. So, it can be very hard to prove causation by one chemical when there are so many other factors at play. What we need is more independent study – not just studies by the companies who make these products. Dr. Phil Landrigan, a recognized expert in environmental health at Mt. Sinai in New York, discusses this in a 2018 paper you can find here.[6]

Our Mental Health at Risk

Regarding mental health, a Scientific American report cited epidemiologic studies connecting pesticide use in farmers with significant increases of depression.[7] Those who used organochlorine pesticides or fumigants had an 80 to 90% risk of depression. The report also reviewed studies in France, which showed a 200% increase in depression treatment for farmers using herbicides. Animal studies suggest these compounds can affect levels of brain neurotransmitters (the molecules of emotion) as well as change the brains ability to repair itself. Other studies show activation of brain neurotransmitters which I believe may also contribute to anxiety levels as well.

Glyphosate-based herbicidal weed killers have increased tremendously over the past few decades – a whopping 100-fold from 1974 to 2014.[8] Animal studies have also suggested that herbicides like glyphosate may not only be toxic to the brain, but may also significantly disrupt our microbiome, which is the good bacteria in the digestive tract: both chronic and sub chronic exposures to these chemicals induced anxiety and depression like behaviors in mice. Specific healthy bacteria like lactobacillus were decreased.[9]

Since the digestive tract is an important factor in brain inflammation and neurotransmitter production, it is likely that this disruption in both the brain and the digestive tract create a higher chance of mental health problems in those exposed.

Steps You Can Take?

Best advice – go natural with your lawn as much as possible.

I realize it may not look as perfect and there may be a few more bugs, but it may add a few years of better health to your life and the life of your kids and pets. You can do your own weeding, which is one of the best exercises to build healthy bones and prevent osteoporosis.[10] If you have a landscaper – tell him or her that you do not want any more pesticides, herbicides or chemical fertilizers. Ask for a list of any compounds applied to your lawn and garden areas.

The “no-mow” movement is gaining traction – you can learn more about it here.[11] Besides it being better for our health, it is also good for the environment, as lawns themselves strip away organic material from the earth’s surface and create runoff into the oceans and rivers.

Also, remember to take your shoes off before coming in the house as well as switch to natural cleaners to help lower toxins in your home too.

*Dandelions are actually very healthy for the liver [12],[13] and is traditionally used to help detoxify the body. Maybe instead of getting rid of them, we should start eating more of them 🙂

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